Dossier - Archangel part 6

Successfully shutting all three doors will allow you to be transported back to Garrus' pad instantaneously. However, when you arrive back, you'll find yourself under attack first from one mercenary group, and then another. The first group that shows up will storm the building from the first floor door near the staircase. Post your party members at the balconies on either side of the second floor, and keep an eye on the staircase itself for any stragglers that might make it up toward your location. The second wave of enemies will be dropped from a gunship through various second floor windows. Thankfully, they'll all be dropped off in a single location, making killing them as easy as shooting fish in a barrel.

Unfortunately, things get decidedly more difficult when it becomes clear that the gunship itself is going to attack. After brutally incapacitating Garrus, you and your active party members will be on your own to take out this threat. Using conventional weapons to destroy the gunship's armor (which is its only health meter) is too slow and cumbersome. Thus, we hope you have five or six heavy ammunition rounds available for your grenade launcher (or other heavy weapon). If you do, you can quickly and easily take out the gunship before things get too heated. Just take cover, wait for the gunship to move to the next window (preferably the one behind your starting position), and then let the heavy ammunition fly. If you're out of heavy ammo, however, you're going to have to be a little more clever in felling the ship.

With the gunship down, it's time to get off of Omega. Worry not, though -- you'll find yourself back in the safety of the Normandy automatically. Garrus was seriously injured in protecting his Archangel alter-ego back on Omega, and he's going to be worse for the wear. Or is he? As Jacob briefs Shepard on Garrus' injuries, the strong Turian himself shows up. Battered and clearly injured, Garrus is still willing to do what is necessary to help out his old friend. After some jokes are leveled back and forth, you'll regain control of Shepard, and will be able to pursue your next course of action at your leisure.